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A piece of rough diamond which has the typical non-transparent skin. This rough diamond is easily clarity graded since the skin is completely transparent. Commonly called a glassie. Color can be just as deceptive as clarity in grading.Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow.Even in a glassie, color may end up two to three grades lower after finishing.olor can be just as deceptive as clarity in grading. Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow.
Obsidian is a natural volcanic glass that can be polished to a very high luster. Some stones of obsidian contain white crystals of the mineral cristobalite. When polished these stones produce a gemstone known as snowflake obsidian.he grossularite garnet used to make tumbled stones, beads and carvings is an opaque, massive garnet that often has an attractive green color. Much of it is found in South Africa where it has been inappropriately called Transvaal Jade (it is not jade and has no mineral relationship with jade).